Has alfie eaten today ? is it possible he may have had something that has stuck in his crop ?
Beak rubbing is very normal behaviour in greys,Rapid "clicking" of the tongue against the beak generally means "I want to be friendly, I won't hurt you".
Beak Grinding is like the
sound of a child grinding his teeth at night, and is It is a sign of a bird feeling secure and content. This will often be heard after your bird settles in for the night, right before he drops off to sleep, and sometimes during sleep.
Beak clicking is a sharp, consistent "clicking" sound used when a bird feels threatened.
If you feel that alfie is not right or in pain then yes a vet visit is in order.